Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a first embodiment of a sequence for adisplay screen or portion thereof with transitional graphical userinterface, showing our new design;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof; and,

FIG. 5 is the fifth image thereof.

The outer perimeter shown in dashed broken lines in the drawingsillustrates a display screen or portion thereof that forms no part ofthe claimed design. The remaining dashed broken lines in the drawingsillustrate portions of the transitional graphical user interface thatform no part of the claimed design.

The areas of stipple shading in the drawings indicate a contrast ofappearance.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-5. The process or period in whichone image transitions to another image forms no part of the claimeddesign.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.